Motor Winding Changeover Switch for Low-Load Compressor Efficiency
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Solution Overview
Problem
Conventional single-phase induction motors used in compressors face efficiency reduction due to irregular winding structures, unbalanced magnetic fields, and secondary resistance losses, leading to complex configurations and increased costs, especially when trying to improve operating efficiency under varying load conditions.
Innovation Solution
The electric motor incorporates a stator coil with a main winding and an auxiliary winding connected in parallel, featuring a winding changeover switch that adjusts the number of turns based on load conditions, connecting all windings at lower loads to increase efficiency and disconnecting them at higher loads to maintain efficiency, eliminating the need for additional capacitors and simplifying the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple capacitors and switches are added to improve operating efficiency under varying load conditions, then operating efficiency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies dynamics by making the winding configuration adjustable based on load conditions. The main winding and auxiliary winding are connected in parallel during low-load operation to improve efficiency, and disconnected during high-load operation to maintain performance. This dynamic reconfiguration allows the motor to adapt to varying load conditions without requiring multiple capacitors or complex switching circuits.
Solution Approach 2:
The patent merges the functions of multiple windings by connecting the main winding and auxiliary winding in parallel during low-load conditions. This combination allows both windings to contribute to the magnetic field generation, improving operating efficiency without requiring additional capacitors or complex control circuits that would increase device complexity.
2Use of energy by moving object
If the number of windings is increased to improve operating efficiency, then operating efficiency is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent uses dynamics to adjust the effective number of windings based on load conditions. During low-load operation, both the main winding and auxiliary winding are connected in parallel, effectively increasing the total number of windings and improving operating efficiency. During high-load operation, the auxiliary winding is disconnected, simplifying the effective winding structure and reducing manufacturing complexity.
3Use of energy by moving object
If windings are disconnected during high-load operation, then operating efficiency is maintained, but energy utilization decreases
Solution Approach 1:
The patent applies dynamics by dynamically switching between different winding configurations based on load conditions. During high-load operation, the auxiliary winding is disconnected to prevent energy loss and maintain operating efficiency. During low-load operation, both windings are connected to maximize energy utilization and improve operating efficiency. This dynamic switching optimizes energy utilization across different operating conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances operating efficiency at both actual and overload conditions by dynamically adjusting the number of turns, reducing coil windings during overloads, and integrating the winding changeover switch within the compressor case for a simpler design and improved reliability.
Implementation Method 1
An electric motor is an apparatus that converts electrical energy into mechanical energy
Data Source
AI summary
An electric motor and a compressor having an electric motor are disclosed herein. The electric motor may include a stator having a stator core and a stator coil, and a rotor provided with a rotational shaft and rotatably disposed with respect to the stator. The stator coil may include a main winding and an auxiliary winding connected to each other with a phase difference. The main winding may be divided into a plurality of main windings so as to be connected to each other and disconnected from each other, and the stator coil may further include a winding changeover switch configured to provide connection and disconnection between the plurality of main windings. Such a configuration may allow operating efficiency at a low load to be increased.